I opened Prefs, navigated to Toolbars/Scripts and copy/pasted Jon's Example Event Script and Select Newest Files. I was able to edit both of these sample scipts from the Toolbars/Scripts window (to look at the code, not modify it) however after closing out Prefs my lister became non responsive. Task Manager showed DOpus using a lot of CPU. Opus is OK again after killing the task and restarting.
The link provided in Example Events.vbs appears to be incorrect.
' Example event script
' (c) 2013 Jonathan Potter
'
' This is a script for Directory Opus.
' See http://www.gpsoft.com.au/redirect.asp?page=scripts for development information.
I'll have to do a bit of monkeying to see if I can remember and reproduce the exact "before" situation. What I do recall is that I had an image open in the DOpus stand alone viewer in addition to the base open lister which was in Dual mode at the time.
BTW, now that I better understand how it all works, I have to say that the new Script capabilities are a really powerful addition, fully justifying the version increment from v10 to v11. Well done to all concerned.